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Integrated current-mode DC–DC boost converter with high-performance control circuit

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Abstract

In this paper, integrated BiCMOS amplifier and current-sensing circuits are introduced for high-performance DC–DC boost converter. By exploiting the advantage of BiCMOS technology, the high gain amplifier and accurately sensed inductor current are obtained in the feedback control circuit. The proposed current-sensing circuit adopts a current-mirror instead of op-amplifier as a voltage follower so that it would reduce power consumption with a smaller chip-size. Bipolar transistor is also applied in the differential pair and current sources of the error amplifier to obtain a fast transient response. Frequency response shows the amplifier gain with the compensator affects significantly on the stability of the converter. The chip is fabricated in 0.35 µm 2-poly 4-metal BiCMOS process. The measurement shows that the current-sensing circuit can operate with accuracy of higher than 90 % at the frequency from 10 to 200 kHz and the transient time of the error amplifier is controlled within 10 µs. The converter with chip-size of 1 mm2 operates at the output voltage of 4.5–9 V with the frequency of 0.01–1 MHz.

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Authors and Affiliations

  1. Chungbuk National University, Cheongju, Chungbuk, Republic of Korea

    Chan-Soo Lee & Nam-Soo Kim

  2. Chungnam National University, Daejeon, Republic of Korea

    Hyoung-Ho Ko

Authors
  1. Chan-Soo Lee
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  2. Hyoung-Ho Ko
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  3. Nam-Soo Kim
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Correspondence to Nam-Soo Kim.

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Lee, CS., Ko, HH. & Kim, NS. Integrated current-mode DC–DC boost converter with high-performance control circuit. Analog Integr Circ Sig Process 80, 105–112 (2014). https://doi.org/10.1007/s10470-014-0310-4

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  • DOI: https://doi.org/10.1007/s10470-014-0310-4

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